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A highly efficient and CO tolerant PdCu electrocatalysts supported on amino-rich, cationic poly(diallyl dimethyl ammonium chloride)(PDDA) functionalized TiO2 (PdCu/TiO2(P)-C) has been developed. The catalysts were characterized by transmission electron microscopy (TEM),X-ray diffraction (XRD),cyclic voltammograms and chronoamperometry. The PtCu particles with average size ∼3.5 nm are well dispersed on TiO2(P). PdCu/TiO2(P)-C catalysts exhibit a superior electrocatalytic activity and stability for the formic acid oxidation reaction compared with the Pd/TiO2(P)-C . Electrochemical measurements indicate that PdCu/TiO2(P)-C(1:2) catalyst has the best performance for formic acid electro-catalytic oxidation in terms of durability and Pd-mass activity among three catalysts (Pd1Cu1,Pd1Cu2,Pd1Cu3). The possible reason is that the addition of Cu is beneficial to lower appropriately the d-band center of Pd and increase the electrochemical active surface area of the PdCu/TiO2(P)-C nanocatalysts, but when the content of Cu rises to a certain extent, the morphology of the catalyst nanoparticles will transform into linear structure leading to increased particle size.

Highly Effective PdCu Electrocatalysts Supported on Polyelectrolyte Functionalized Titanium Dioxide for Direct Formic Acid Fuel Cells